<p><strong>Fig. 2.24.</strong> In this diagram of an estuary, the mouth of the estuary is where ocean water flows in (dark blue) and the head of the estuary is where freshwater flows in (light blue). Mixing of these waters can lead to patterns of stratification.</p>

Fig. 2.24. In this diagram of an estuary, the mouth of the estuary is where ocean water flows in (dark blue) and the head of the estuary is where freshwater flows in (light blue). Mixing of these waters can lead to patterns of stratification.

Image by Byron Inouye